EXCEPTIONS

An Example of Exceptions

11.4

try {

thrower(args[i]);

System.out.println("Test \"" + args[i] +

"\" didn t throw an exception");

} catch (Exception e) {

System.out.println("Test \"" + args[i] +

"\" threw a " + e.getClass() +

"\n

with message: " + e.getMessage());

}

}

}

static int thrower(String s) throws TestException {

try {

if (s.equals("divide")) {

int i = 0;

return i/i;

}

if (s.equals("null")) {

s = null;

return s.length();

}

if (s.equals("test"))

throw new TestException("Test message");

return 0;

} finally {

System.out.println("[thrower(\"" + s +

"\") done]");

}

}

}

If we execute the test program, passing it the arguments:

divide null not test

it produces the output:

[thrower("divide") done]

Test "divide" threw a class java.lang.ArithmeticException

with message: / by zero

[thrower("null") done]

Test "null" threw a class java.lang.NullPointerException

with message: null

[thrower("not") done]

Test "not" didn t throw an exception

[thrower("test") done]

Test "test" threw a class TestException

with message: Test message

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